M. . S. Rahman, R. . K. Zoardar, D. A. Begum, and M. . F. Islam, “Separation of Ti(IV) and Fe(III) from Aqueous Sulphate Solution by Cyanex 272 [Bis(2,4,4-Trimethylpentyl) Phosphinic Acid] in Kerosene: Separation of Ti and Fe from Sulphate Using Cyanex”, Pakistan Journal of Scientific & Industrial Research, vol. 52, no. 5, pp. 231–238, Oct. 2009.